What does my dream mean?

A FEW WEEKS AGO I HAD A DREAM THAT MY DAUGHTER, FANCE AND SON WERE IN A ROUND POOL. THIS WASNT A DEEP POOL AS WE WERE ABLE TO STAND IN IT. WE WERE ALL HAPPY UNTIL I LOOKED AROUND, I ASKED MY FIANCE WHERE MY SON WAS, WE COULDNT SEE HIM. I LOOKED IN THE POOL AND SAW HIM SNUGGLED UP NAKED AS IF HE WERE ASLEEP AT THE BOTTOM OF THE POOL. I TRYED TO GET HIM BUT THE PART WHERE HE WAS IN WAS SO DEEP THAT I COULDNT REACH HIM. I TRYED SEVERAL TIMES BUT STILL COULDNT REACH HIM, THE WATER JUST SEEMED TO BE VERY DEEP. I GOT OUT OF THE POOL AND LOOKED DOWN AT MY SON AND POINTED THERE HE IS. I THEN AWOKE CRYING AT NOT BEING ABLE TO SAVE HIM. I HAD VISIONS OF HIM ALL THAT DAY AND THE DAY AFTER. I CAN STILL SEE HIM NOW LYING AT THE BOTTOM OF THE POOL JUST LOOKING AS IF HE WAS ASLEEP. CAN YOU TELL ME WHAT THIS MEANS AS IT IS VERY DISTURBING